Performance – IT Blog

Monitoring Combined Network Interface Channels in Zabbix

I decided to add to Zabbix a check of the number of Combined channels of network interfaces, since when loading the server there could be different situations when my scripts changing their number were not always executed or were executed, but the value was reset during the system startup.

Distribution of network card interrupts across processor cores

I will give an example of the distribution of interrupt network interfaces on the processor cores.
For example, I’ll take a server with accel-ppp, 6Gb/s traffic, 500K + pps, nat with ipoe and 6000 dchp clients.
Also, be sure to disable hyper-threading in the BIOS, since load balancing on virtual cores can greatly increase the load on some physical cores.

Cisco 6509e Net Input CPU Load

Once on a single Cisco 6509e switch configured as L3 and with a standard CPU load of 10%, the load suddenly increased to 40%.

How to catch flood on Huawei MA5600

Once, on the port of one of the L3 switches of the Cisco 6509e, to which the Huawei MA5683T was connected, I saw that Multicast traffic increased very much, while the CPU load of the switch processor increased by 30%.

Install Phabricator on Ubuntu

Phabricator is a free set of web tools for joint development of various software products, it has built-in chat, code verification, problem tracking, etc.

List of online services for testing a site

Below are a few links to popular services for testing sites.

Configuring and tuning HPE ProLiant Servers for low-latency applications

Document Name: Configuring and tuning HPE ProLiant Servers for low-latency applications
Edition: 10 (October 2017)
File size: 0.5 MB
Language: English

How to change join_buffer_size in MySQL

I will give an example of changing join_buffer_size in MySQL.
join_buffer_size determines the size of the buffer for index scanning and joins without indexes. I recommend adding indexes or slightly increasing join_buffer_size (but in this case a full table scan will be performed).

How to enable Slow Query Log in MySQL

Enabling slow_query_log and log_queries_not_using_indexes will help to identify slow queries and queries without indexes that affect the performance of the MySQL server.

Optimize web images with jpegoptim

Ubuntu / Debian installation command: